3138735661 has 16 divisors (see below), whose sum is σ = 3197795328. Its totient is φ = 3080462400.

The previous prime is 3138735637. The next prime is 3138735683. The reversal of 3138735661 is 1665378313.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3138735661 - 2¹⁷ = 3138604589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3138736661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5634795 + ... + 5635351.

It is an arithmetic number, because the mean of its divisors is an integer number (199862208).

Almost surely, 2^3138735661 is an apocalyptic number.

It is an amenable number.

3138735661 is a deficient number, since it is larger than the sum of its proper divisors (59059667).

3138735661 is a wasteful number, since it uses less digits than its factorization.

3138735661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its digits is 272160, while the sum is 43.

The square root of 3138735661 is about 56024.4202201147. The cubic root of 3138735661 is about 1464.1477819019.

The spelling of 3138735661 in words is "three billion, one hundred thirty-eight million, seven hundred thirty-five thousand, six hundred sixty-one".